Update tenant-allow-block-list-teams-domains-configure.md

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Author: chrisda

defender-office-365/tenant-allow-block-list-teams-domains-configure.md

@@ -15,7 +15,7 @@ ms.collection:
   - tier1
 description: Admins can learn how to block domains in Microsoft Teams using the Tenant Allow/Block List.
 ms.service: defender-office-365
-ms.date: 07/29/2025
+ms.date: 08/04/2025
 appliesto:
   - ✅ <a href="https://learn.microsoft.com/defender-office-365/eop-about" target="_blank">Default email protections for cloud mailboxes</a>
   - ✅ <a href="https://learn.microsoft.com/defender-office-365/mdo-about#defender-for-office-365-plan-1-vs-plan-2-cheat-sheet" target="_blank">Microsoft Defender for Office 365 Plan 1 and Plan 2</a>
@@ -26,6 +26,9 @@ appliesto:
 
 [!INCLUDE [MDO Trial banner](../includes/mdo-trial-banner.md)]
 
+> [!NOTE]
+> The feature described in this article is currently in Preview, isn't available in all organizations, and is subject to change.
+
 In all organizations with Microsoft Teams and cloud mailboxes, admins can create and manage block entries for domains in Microsoft Teams using the Tenant Allow/Block List. These blocked domain entries also appear on the **Organization settings** tab of the **External access** page in the Microsoft Teams admin center at <https://admin.teams.microsoft.com/company-wide-settings/external-communications> in the **Teams and Skype for Business users in external organizations** section:
 
 :::image type="content" source="media/tenant-allow-block-list-teams-domains.png" alt-text="Screenshot of the External access page in the Microsoft Teams admin center showing blocked domains." lightbox="media/tenant-allow-block-list-teams-domains.png":::